How does a starburst end? What might happen to the galaxy afterwards?
What will be an ideal response?
A starburst might end by simply using up all the available gas to form stars or it may end by the combined effect of many supernovae driving a wind that blows all the gas out of the galaxy. The galaxy will then age, with old stars dying but no new stars forming until enough gas has accumulated, either from the remnants of old stars or by gas falling back into the galaxy. The halt in star formation can be billions of years.
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A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. If the block had been originally at rest and is free to move, what is its resulting speed?
a. 800 m/s c. 16 m/s b. 80 m/s d. 8 m/s
The force of gravity acts on an object only when it is falling
Indicate whether the statement is true or false
What is the primary source of erosion on the Moon today?
What will be an ideal response?
A 200-g metal container, insulated on the outside, holds 100 g of water in thermal equilibrium at
A 21-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.00°C. Assume there is no heat exchange with the surroundings. For water, the specific heat is 4190 J/kg · K and the heat of fusion is 3.34 × 105 J/kg. The specific heat for the metal is closest to A) 3850 J/kg ? K. B) 2730 J/kg ? K. C) 4450 J/kg ? K. D) 4950 J/kg ? K. E) 5450 J/kg ? K.